Electrical apparatus.



F. SIEBER;

ELECTRIGAL APPARATUS.

APPLICATION man APR. 24. 1915.

Patented Nov. 13, 1917.

39 we m .S t mm S r i H J F9. .b

lTED STATES PATENT ()FEICE.

FERDINAND SIEBER, OF CHARLOTTENBURG. GERMANY, ASSIGNOI} T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL APPARATUS.

Specification 0! Letters Patent.

'latented Nov. 12;, 1917.

Amfl'rcation filed April 24, 1915. Serial No. 23,651.

To all who: it may concern:

in it known that I, Fnunixasn Sir-Luau, n

.iollowing is a. specification.

My. invention relates to alternating cur: rent electrical apparatus Wiltl'Ulll the leads of the apparatus are necessarllyor desirably passed through bodies or masses of magnetic material. Such cases arise frequently in practice, as for example with transformers and switches where the leads must pass through the iron or steel containing tank or case, and with induction regulators where the leads from the rotary element pass through a lmaring, or support or anchor for the leads. In each such case the magnetic flux developed in the ma etic material re sults in losses which in e themselves evident by voltage drop and local lieating.

The object of my invention is to reduce these losses in a simple and practicable way. I accom lish this object by placing near each lea one or more short-circuited windings which surrounds such a section of the magnetic material as to'interlink with the magnetic tlux produced by the lead. Structures embodying my invention may assume various forms.

In the accompanying drawings and followin description, I have illustrated and descri 'd an embodiment of my invention in induction regulators. Figure 1 is an elevation, partly in'section, of an induction regulutor embodying my invention. ,Fig. 2 is a plain view, also partly insection, of 9 part of the regulator of Fig. 1.

The rotor 10 of the regulator of Fig.1 is carried on the she t 11 within the stator 12, and is capable of *ing' rotated more or less by means of the hand wheel 13- and the worm and sector 14 within this stator. The winding 15 of the rotor has six leads 16, 17, 18, etc., which are carried through a. support or anchor 19 carried on the shaft 111 This support. or anchor comprises an annular iron or steel diskaud relieves the connections between the leads and the rotor winding from the stresses'due to the rotating of the rotor. The regulator so far described does not differ materially from a form of regulator now in such a device, llUWt'YL'l', the leads l6, l7, 18, etc, produce umgnetie llux in the support or anchor 19, and this in turn results in local heating anda drop in voltage. The path of the flux about, lead 17 may be roughly represented by the dotted line 20. The flux about each of the other leads follows similar paths. According to my invention the fall in voltage and local heating at. each lead is reduced by means of one or more short-circuited turns or windings .21, surrounding such sections of the magnetic material as to interlink with more or lessof the magnetic llux' produced by the lead in question. Each short-cn'cuitcd turn or winding comprises one or more turns of good electrical con- .ducting material closed upon itself and each surrounds a section more .or less extensive; preferably each surrounds such a section as to embrace within itself substantially all the flux produced in the magnetic material by the adjacent lead.

In the particular illustrated, each of two ad acent leads 16, 17, 18, etc. are reciprocally positive and negative (substantially). In-such a case it is preferable that each short-circuited turn or winding surround the section of magnetic matcrial between the reciprocally positive and ne utive leads. Thus the winding 21 surroum the complete section b tween the leads 16 and 17 and the winding 22 surrounds the co nlete section between the leads 1'! and 18. ubstantially all the flux produced by the lead 11 is by this arrangement interlinked with both of the short circuited windings 21 and 22. Similar 'shOrt-circuited windings surround the sectiong-x between the other "pairs of leads.

While I have described the principle" of my invention and the best mode I have contom lated for applying this principle, other in ifi'cations will occur to those skilled in b Letters Patent of the Un'itcd Stam s,-

1. An alternating current elctricul'apparatus comprising the combination with a winding, :1 mass of magnetic material and two reciprocally positive and ne tive leads therefrom passing through sai magnetic this art and I aim in the appended claims to -m'aterial of a shortclrcuited winding surrounding the section ofrnegnetic material 1 between said leads;

. 2. An alternating current electrieel app).-

5 ratus comprising the combinetion with a winding, a mess of magnetic material and a.

lurality of elternatelil lmsitive and negative eads from said-win gs pessingthrough and substantially surrounding a portion of 10 said magnetic material, of a plurality of short circuited windings about said portion' I 'of said magnetic material, each surrounding a, section of the 'megnetie material between two adjacent reciprocally positive and negative leads. 15

In witness whereof, I have hereunto set my hand this 10th day of March, 1915.

FERDINAND SIEBER.

Witnesses:

Wonmmn mm, 4 HENRY HABPEIL 

